Car alarm problem

For the last week or so, whenever im driving my car and i put the brakes on my car alarm goes off. It happens more often when im going downhill. When i have my alarm on I cannot start the car, so it is an immobilizer. Its really annoying. It's a clifford alarm system. What do you guys think is the problem? thanks

you have a wire that is groundin out somwhere. you need to trace all the wires for the alarm and make sure there is no broken or stripped out wires touching anything metal. if that dont work rip it out and buy a new one